I've a dell E6500 running F19. Did a yum upgrade from F18. All has been working great untill I tried to upgrade the following:
mesa-libEGL.i686 9.1-6.fc19 updates-testing mesa-libEGL.x86_64 9.1-6.fc19 updates-testing mesa-libEGL-devel.x86_64 9.1-6.fc19 updates-testing mesa-libGL.x86_64 9.1-6.fc19 updates-testing mesa-libGL-devel.x86_64 9.1-6.fc19 updates-testing mesa-libGLES.x86_64 9.1-6.fc19 updates-testing mesa-libOSMesa.x86_64 9.1-6.fc19 updates-testing mesa-libgbm.i686 9.1-6.fc19 updates-testing mesa-libgbm.x86_64 9.1-6.fc19 updates-testing mesa-libglapi.i686 9.1-6.fc19 updates-testing mesa-libglapi.x86_64 9.1-6.fc19 updates-testing
Gnome-shell stops, reboot into a blank screen. Had to rollback and it works great.